. Each of these processes can function separately or in combination to meet environmental demands such as problems finding and problem solving.
             One major criticism of the early work in thinking is methodological. The method of the introspection is a very difficult one since the experimenter must rely on the subject's self-report. It fits the requirements of science only if we assume that the data are the subjects'reports rather than the subjects' experiences: the reports are observable for all to see and hear, but the experiences are not. The real problem is
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